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  Organic light emitting device and method of manufacturing the sameUSPTO Application #: 20080001531Title: Organic light emitting device and method of manufacturing the same Abstract: An organic light emitting device includes a first electrode for providing holes, a second electrode facing the first electrode and providing electrons, an organic luminescent layer interposed between the first and second electrodes, and an electron transfer layer disposed between the second electrode and the organic luminescent layer, wherein the electron transfer layer is a single layer including electron transfer members so that the electron transfer layer injects and transports electrons to the organic luminescent layer while preventing holes from the first electrode from flowing into the electron transfer layer. (end of abstract)
Agent: Seyfarth Shaw, LLP - Washington, DC, US Inventor: Sung Hee Kim USPTO Applicaton #: 20080001531 - Class: 313504 (USPTO) The Patent Description & Claims data below is from USPTO Patent Application 20080001531. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001]This invention claims the benefit of Korean Patent Application No. 10-2006-055239 filed in Korea on Jun. 20, 2006, and Korean Patent Application No. 10-2007-046037 filed in Korea on May 11, 2007, which are hereby incorporated by reference in their entirety. BACKGROUND OF THE INVENTION [0002]1. Field of the Invention [0003]Embodiments of the present invention relate to a light emitting device, and more particularly, to an organic light emitting device and a method of manufacturing the same. Although embodiments of the invention are suitable for a wide scope of applications, it is particularly suitable for achieving a small device thickness, improving sharpness of an image, and simplifying a manufacturing process. [0004]2. Description of the Related Art [0005]Information processing equipment (IPE), and a display device that displays data of an electrical signal processed in the IPE in the form of an image has been developed. An example of a representative display device includes a liquid crystal display device, an organic light emitting device, or a plasma display panel. The liquid crystal display device displays an image using a liquid crystal, the organic light emitting device displays an image using an organic luminescent material, and the plasma display panel displays an image using a plasma. These display devices are mainly used for the IPE, such as computers, notebook computers, watches, mobile phones, MP3 players, or television receiver sets. [0006]The organic light emitting device that displays an image using the organic luminescent material does not require a light supply unit, such as a backlight, and thus has a significantly small volume and weight. More specifically, the organic light emitting device includes a pair of conductive electrodes, and an organic luminescent layer interposed between the conductive electrodes. The organic luminescent layer includes an organic luminescent material. When a forward current is applied to the conductive electrodes of the organic light emitting device, light is generated from the organic luminescent layer. However, the related art organic light emitting device has problems of a complicated manufacturing process, a long manufacturing time, and a large overall thickness because an electron injection layer (EIL) and an electron transport layer (ETL) are formed on the electrode. Also, if the thicknesses of the electron injection layer and the electron transport layer of the related art organic light emitting device are not uniform, undesired light may be generated, causing image quality to considerably degrade, such as sharpness. SUMMARY OF THE INVENTION [0007]Accordingly, embodiments of the present invention is directed to an organic light emitting device and a method of manufacturing the same that substantially obviate one or more problems due to limitations and disadvantages of the related art. [0008]An object of embodiments of the invention is to provide a single-layer electron transfer layer for providing electrons to the organic luminescent layer. [0009]Additional features and advantages of embodiments of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of embodiments of the invention. The objectives and other advantages of the embodiments of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. [0010]To achieve these and other advantages and in accordance with the purpose of embodiments of the invention, as embodied and broadly described, an organic light emitting device includes a first electrode for providing holes, a second electrode facing the first electrode and providing electrons, an organic luminescent layer interposed between the first and second electrodes, and an electron transfer layer disposed between the second electrode and the organic luminescent layer, wherein the electron transfer layer is a single layer including electron transfer members so that the electron transfer layer injects and transports electrons to the organic luminescent layer while preventing holes from the first electrode from flowing into the electron transfer layer. [0011]In another aspect, a method of manufacturing an organic light emitting device includes forming a second electrode on a substrate, forming a hole injection layer and a hole transport layer sequentially on the second electrode, forming an organic luminescent layer on the hole transport layer, forming an electron transfer layer, including a plurality of electron transfer members and an insulating layer, on the organic luminescent layer, and forming a first electrode on the electron transfer layer. [0012]In another aspect, a method of manufacturing an organic light emitting device includes forming a first electrode on a substrate, forming an electron transfer layer, including a plurality of electron transfer members and an insulating layer, on the first electrode, forming an organic luminescent layer on the electron transfer layer, forming a hole transport layer a hole injection layer sequentially on the organic luminescent layer, and forming a second electrode on the a hole injection layer. [0013]In yet another aspect, an organic light emitting device includes a first substrate having a display device having a first electrode the first substrate for providing holes, a second electrode facing the first electrode and providing electrons, an organic luminescent layer interposed between the first and second electrodes and an electron transfer layer disposed between the second electrode and the organic luminescent layer, wherein the electron transfer layer is a single layer including single-crystal silicon particles so that the electron transfer layer injects and transports electrons to the organic luminescent layer while preventing holes from the first electrode from flowing into the electron transfer layer, a second substrate having a driving device, and an encapsulating member joining the first and second substrate. [0014]It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS [0015]FIG. 1 is a cross-sectional view of an organic light emitting device according to a first embodiment of the present invention; [0016]FIG. 2 is a view for describing a process of forming an electron transfer layer of an organic light emitting device according to an embodiment of the present invention; [0017]FIG. 3 is a cross-sectional view of an electron transfer member constituting an electron transfer layer of the organic light emitting device of FIG. 1; [0018]FIG. 4 is a cross-sectional view illustrating holes and electrons provided to an organic luminescent layer in the organic light emitting device of FIG. 1; [0019]FIG. 5 is a cross-sectional view of an organic light emitting device according to a second embodiment of the present invention; [0020]FIG. 6 is a cross-sectional view of an electron transfer member constituting an electron transfer layer of the organic light emitting device of FIG. 5; [0021]FIG. 7 is a cross-sectional view illustrating holes and electrons provided to an organic luminescent layer of the organic light emitting device of FIG. 5; Continue reading... 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